Fortitude Gold says its small County Line Mine near Gabbs will require minimal construction and infrastructure, so it can be ...

Pima County issued a violation notice to Freeport McMoRan mining company last week after dozens of Green Valley residents reported clouds of tailings dust coming from the Sierrita Mine on Jan. 9.

The mining giant Freeport McMoRan will pay $230,000 to settle repeated alleged violations of Pima County air quality rules due to tailings dust blanketing Green Valley from the Sierrita Mine, ...

The project is funded by the Critical Materials Innovation Hub, U.S. DOE Energy Innovation Hub, led by Ames National ...

Kanawha River Canal Washington Aqueduct ... publications, specifications, photographs, drawings, and maps that document the construction of several architectural and ... (later General) Henry W.